US PATENT SUBCLASS 434 / 408
.~ Chalkboard or equivalent means having easily erasable surface

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

365  DF  MEANS FOR DEMONSTRATING APPARATUS, PRODUCT, OR SURFACE CONFIGURATION, OR FOR DISPLAYING EDUCATION MATERIAL OR STUDENT'S WORK {37}
408.~ Chalkboard or equivalent means having easily erasable surface {14}
409  DF  .~.~> Mark formed by magnetic attraction between materials (e.g., particles in sheet made visible by movement of magnet over sheet, etc.)
410  DF  .~.~> Mark formed by bonding sheet to underlying surface with pressure-applying stylus (e.g., Magic Slate, etc.)
411  DF  .~.~> Erasable surface on endless belt
412  DF  .~.~> Erasable surface on reel-mounted sheet
413  DF  .~.~> Separate elements having erasable surfaces {1}
415  DF  .~.~> With pencil holder or sharpener
416  DF  .~.~> With chart, illustration, or indicia
417  DF  .~.~> Chalkboard cleaning means, chalk or eraser holder, or chalk dust receiver
418  DF  .~.~> With ruler, straight edge, or holder therefor
419  DF  .~.~> Pivotal about horizontal axis
420  DF  .~.~> Vertically adjustable
421  DF  .~.~> Attached to wall
422  DF  .~.~> Hand-carried school slate {2}
425  DF  .~.~> Artificial slate formed of plural constituents

DEFINITION

Classification: 434/408

Chalkboard or equivalent means having easily erasable surface:

(under subclass 365) Subject matter including a panel having a surface from which marks made by chalk or other means can easily be erased.

SEE OR SEARCH THIS CLASS, SUBCLASS:

211, for similar devices used for teaching mathematics.